sorry but only to me these FDCs seem super fake?  the CS first day stamp does not take well the big stamp and even the post stamp is badly made.  given the dump of the price I think it is very likely a but manipulation of the FDC ... how come until a few months ago there were only those with the original mail envelope and now there are 4/5 types?

This Is the only original FDC

Will teilen:
https://www.willhaben.at/iad/kaufen-und-verkaufen/d/ersttagsbrief-crypto-stamp-green-gruen-fdc-5-stelliger-code-5-digits-cod-rar-326907134/

What do You think about?
Dont forget that Just 2500 FDC exist